Enhancing Sensitivity in Detecting Severe Fever With Thrombocytopenia Syndrome Virus: Development of a Reverse Transcription–Droplet Digital Polymerase Chain Reaction.

This article focuses on the development and evaluation of a reverse transcription–droplet digital polymerase chain reaction (RT-ddPCR) method for detecting severe fever with thrombocytopenia syndrome (SFTS), a highly fatal tick-borne infectious disease caused by the SFTS virus (SFTSV). The study, conducted with 111 patients at a designated hospital in China, demonstrated that RT-ddPCR has a significantly lower limit of detection (2.46 copies/µL) compared to the conventional reverse transcription–quantitative polymerase chain reaction (RT-qPCR) (103.29 copies/µL), offering higher sensitivity especially after 10 days of disease onset. RT-ddPCR results correlated with clinical laboratory markers such as platelet count and liver enzymes, suggesting its potential utility in monitoring disease progression and severity. While RT-ddPCR shows promise for improved diagnosis and viral load quantification in SFTS, the study notes limitations including single-center data and the need for further multicenter validation and optimization for broader clinical application.